Jailbreak and unlock iphone 4?

I have an iphone 4 which i want to jailbreak and unlock. Can anyone suggest a way to do it.
I'm new doing this, so I need a tutorial or step by step to do it.

the specs of the phone are:
iphone 4
ios: 5.1(9B176)
Modem Firmware: 04.12.01

You can jailbreak the iPhone with this tutorial here: http://howto-jailbreak-iphone.com/

You can get the Jailbreaking guide for an iPhone 4 from http://iphonejaibreakingguide.com/. Once after Jailbraking you can unlock your iPhone4 through remote unlocking method. It is the safest and easiest method to unlock an iPhone. It is also an affordable method too. You can get the remote unlocking from http://www.Unlocking4u.com/. This site is a legit source to rely on accurate unlocking solutions. All the best mate.
Here are the steps for unlocking an iPhone4,
1. Wait for to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 4 phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 4 to iTunes with a NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 4.
6. Disconnect your Apple iPhone 4 and reconnect it after 10 seconds.
7. Your Apple iPhone 4 is now unlocked.

Procedure for Jailbreak and Unlock Apple iOS 5.1 with Redsn0w 0.9.10b6

Download the tool package provided above and then follow the following simple steps to Jailbreak and Unlock Apple iOS 5.1 running in iPhone 4.

Step 1: Connect your iDevice with your PC via USB, and open iTunes 10.6 then restore to iOS 5.1 if you don't already have it on your device.
Step 2: Start Redsn0w, press on "Jailbreak" > Next.
Step 3: Now make sure your device is both OFF and PLUGGED IN to the computer before you click "Next". (At this stage you will be presented with a screen where you will be guided on how to enter DFU mode. Quickly hold "Power" button and then while holding the "Power" button, you will now have to hold "Home" button too. Now after few seconds release "Power" button but keep holding "Home" button until installation begins.)
Step 4: Now select "Install Cydia" and click "Next". Optionally (if available), you can also select any other option you like.
Step 5: Wait until you get iOS 5.1 jailbroken in few minutes.

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